EP0692569B1 - Verfahren und Vorrichtung an einem Papiermaschinenzylindertrockner mit Zweisiebführung - Google Patents
Verfahren und Vorrichtung an einem Papiermaschinenzylindertrockner mit Zweisiebführung Download PDFInfo
- Publication number
- EP0692569B1 EP0692569B1 EP19950108417 EP95108417A EP0692569B1 EP 0692569 B1 EP0692569 B1 EP 0692569B1 EP 19950108417 EP19950108417 EP 19950108417 EP 95108417 A EP95108417 A EP 95108417A EP 0692569 B1 EP0692569 B1 EP 0692569B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- wire
- dryer
- web
- paper web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
- D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
- D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems
Definitions
- the invention relates to a method in a cylinder dryer of a paper machine, where using the paper web on the top cylinders an upper sieve and on the lower cylinders using a lower sieve is guided, with the screens from the drying cylinders and in their Intermediate guide rollers are guided such that the Web on the top cylinder row from the top wire in direct drying contact with the surface of the top cylinder and accordingly from the bottom wire the surface of the lower cylinder is pressed and the web of one Row of cylinders led to the other as a free train over a certain distance is, whereby air is blown and the air, in particular heated fresh air directly into the pockets formed by the dryer fabric and the paper web is blown in.
- the invention further relates to a device for performing of the procedure for a cylinder dryer of a paper machine, is provided with a two-wire guide, the air blowing device having the air injection device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided.
- GB 2 091 400 describes a method and a device known in the air in the area between the free train of the paper web, the surface of the drying cylinder and the sieve Guide roller is blown. Similar devices are e.g. from DE 1 120 262, US 1,660,640 or US 3,263,344 known. In all of these cases there is a risk with faster running paper machines that in this area also builds up excess pressure due to air being carried along and thereby tearing off the paper web.
- the invention now aims at the disadvantages of the known methods and devices avoid, and especially at high machine speeds ensure adequate drying, and the risk of blowing off the Paper web from dryer fabric and web breaks through web flutter hold on.
- the invention is therefore characterized in that in addition air the dryer fabric is sucked off, the suction from the incoming Gusset, formed by running from the dryer fabric onto a guide roller, i.e. from the area between that of the drying cylinder and the free circumference of the guide roller running together with the dryer Paper web, takes place and the amount of air extracted at least essentially corresponds to the amount of air blown in.
- suction of the Air through the dryer can ensure even suction across the Web running direction can be achieved so that unfavorable cross currents Air can be prevented. This also causes overpressures in this Avoided area, so that the risk of tearing off the paper web is minimized. This is especially true when the amount of air extracted corresponds at least essentially to the amount of air blown in.
- An embodiment of the invention is characterized in that the Air is blown in a targeted direction, with the air at least in two different directions can be blown.
- the targeted Air injection can create a beneficial flow along the pockets Drying cylinder or the paper web can be achieved, with the Convection drying is still improved.
- a further development of the invention is characterized in that the air before being blown into the pockets it is pre-distributed to give an even To reach air supply. Through this pre-distribution and the even Air supply, which is particularly transverse to the web running direction, is also a corresponding uniform drying of the paper web is guaranteed.
- a particularly favorable development of the invention is characterized in that that an air volume of 100 to 500 m3 per hour and meter Working width, preferably from 200 to 300 m3 per hour and meter Working width, is blown. By blowing in these amounts of air the paper web dries particularly well.
- Another embodiment of the invention is characterized in that the speed of the blown air jets in the range of 10 m / s up to 50 m / s, suitably between 20 m / s and 40 m / s.
- the speed of the blown air jets in the range of 10 m / s up to 50 m / s, suitably between 20 m / s and 40 m / s.
- a favorable development of the invention is characterized in that the speed of the paper web in the range from 600 to 1500 m / min, is preferably between 1000 to 1400 m / min. With such a Machine speed or speed of the paper web becomes one optimal drying achieved, i.e. there is neither insufficient drying another overdrying of the paper.
- the device according to the invention for a cylinder dryer Paper machine with a two-wire guide which is an air blowing device has, the air blowing device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided, is characterized in that an additional Suction box in the drying cylinders lying next to each other remaining spaces from those above each other Drying cylinders running dryer fabrics and the free sectors of that guide roller in question are provided, is provided.
- the arrangement of an additional suction box makes it particularly easy suck off the air blown into the pockets cheaply, furthermore one particularly favorable assembly of the suction boxes can be done. Through this local attachment of the suction box is further guaranteed that a Damage to the paper web through the suction box is excluded because only the dryer fabric is guided along the top of the suction box becomes.
- a favorable development of the invention is characterized in that the air blowing device, in particular blowing openings arranged in rows, in particular has holes and / or slots for the air outlet, wherein several rows of holes or slots can be provided, which in different Blowing direction are directed.
- the air blowing device allows the air to be put into the pockets particularly cheaply bring in and the air flow in the bag accordingly for optimal Influence drying.
- a favorable embodiment of the invention is characterized in that in the air blowing device a device for pre-distributing the air for uniform, appropriately vertical, blow-out is provided.
- this pre-distributing device is particularly suitable for the flow in the pockets are influenced favorably, with flows in the transverse direction to the web running direction be avoided.
- this can also be done from the feed side be designed to be conical, with a feed of is possible on both sides.
- a particularly favorable embodiment of the invention is characterized in that that the air injection device is designed as a scraper bar, the scraper can act as an air guide.
- the air injection device is designed as a scraper bar
- the scraper can act as an air guide.
- a favorable embodiment of the invention is characterized in that the suction box on the inlet side and / or on the outlet side to the sieve has seals directed towards the drying cylinder, for example brushes, which run transversely to the web running direction and essentially over the the entire width of the paper web or dryer fabric is sufficient.
- suction box has cover plates on its end faces that cover the room from the suction box to the dryer fabric with the paper web attached to it or to the free dryer fabric or to the circumference of the guide roller that is not touched by the screen seal it.
- a particularly favorable development of the invention is characterized in that that the axis of the guide roller from the vertical center plane of two adjacent drying cylinder in the direction of the web running direction first drying cylinder is moved.
- This configuration is used especially at high machine speeds, i.e. high Speeds of the paper web, a particularly good contact of the paper web reached to the dryer fabric when draining from the drying cylinder. In In this area there is therefore only a very short free pull of the paper web to the following drying cylinder.
- FIG. 1 shows a section of a cylinder dryer, in to which the invention is applied
- FIG. 2 shows a variant of the invention
- Fig. 3 shows a further variant of the invention
- Fig. 4 shows a detail 3
- FIG. 5 a section along the line V-V in FIG. 2 shows.
- the cylinder dryer shown in Fig. 1 of a paper machine consists in essentially from a series of upper drying cylinders 1, 2, 3 as well a row of lower drying cylinders 4, 5, 6, around which the paper web 7 to be led.
- the paper web 7 lies directly on the individual drying cylinders 1 to 6.
- a top wire 8 This top wire is from the Separated paper web and guided over upper (screen) guide rollers 10, 11.
- Corresponding a lower sieve 9 runs over the lower drying cylinders 4, 5, 6, which is guided over lower (screen) guide rollers 12, 13.
- Fig. 2 shows a larger section for the first variant of the Air blowing device.
- the paper web 7 runs together with the upper dryer fabric 8 upper drying cylinder 3 and onto the (sieve) rotating in direction 29 Guide roller 11 on.
- the paper web 7 now runs in a free train to the lower one Drying cylinder 5.
- the upper drying wire 8 is guided by the guide roller 11 deflected and runs to the next upper drying cylinder 2, where it is the already there paper web 7 more strongly to the upper drying cylinder 2 presses.
- 20 air in through an air injection tube the pocket 24 blown.
- FIG. 3 shows the analog situation with another embodiment of the Air injection pipe.
- a scraper bar 18 specially designed as a tube is used here.
- FIG. 4 shows an enlarged section of the lower drying cylinder 4 together with the scraper beam 18 designed as an air injection device.
- the fresh air enters space 40 of doctor bar 18 introduced and through a distributor 41, which preferably bores contains, evenly directed into a room 42 and then in the direction 38 or 39 blown into the pocket 22.
- FIG. 5 now shows a section along the line V-V in FIG. 2.
- This section line was chosen, in particular the exhaust or suction openings to be able to represent.
- the air injection pipe 20 is through a nozzle 43 air supplied.
- the blow-out into the pocket 24 can, on the one hand, be carried out by Holes 44 arranged in rows or through correspondingly arranged slots 45 done.
- Holes 44 arranged in rows or through correspondingly arranged slots 45 done.
- the suction in the suction box 15 can also through holes 46 arranged in rows or through accordingly arranged slots 47 take place.
- cover plates 35 and 36 on the end faces of the suction box intended.
- the outlet openings 44 and 45 can also be of different sizes have different amounts in the appropriate direction blow out.
- the suction openings 46 and 47 can also be used have different sizes to get the most out of the space between Suction box and free wire or from the incoming gusset on the Vacuum guide roller. It proves to be particularly favorable for the extraction if the distance between guide roller and suction box is between 1 and 20 mm, is preferably 4 to 10 mm.
- the air injection device can also take other forms, e.g. to the Gussets have a triangular shape. Also, for example optimal design of the flow in the pocket additional Air vents in further directions be provided.
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- Paper (AREA)
Description
Claims (13)
- Verfahren in einem Zylindertrockner einer Papiermaschine, in dem die Papierbahn an den Oberzylindern (1, 2, 3) unter Verwendung eines Obersiebes (8) und an den Unterzylindern (4, 5, 6) unter Verwendung eines Untersiebes (9) geführt wird, wobei die Siebe (8, 9) von den Trockenzylindern (1, 2, 3, 4, 5, 6) und in deren Zwischenräumen angeordneten Leitwalzen (10, 11, 12, 13) geführt werden, derart, daß die Bahn (7) an der Oberzylinderreihe (1, 2, 3) vom Obersieb (8) in direkten Trocknungskontakt mit der Oberfläche der Oberzylinder und entsprechend vom Untersieb gegen die Oberfläche der Unterzylinder gepreßt wird und die Bahn (7) von einer Zylinderreihe (1, 2, 3 bzw 4, 5, 6) zur anderen über eine bestimmte Strecke als freier Zug geführt wird, wobei Luft eingeblasen wird, und die Luft, insbesondere erhitzte Frischluft direkt in die vom Trockensieb (8, 9) und der Papierbahn (7) gebildeten Taschen (22, 23, 24, 25) eingeblasen wird, dadurch gekennzeichnet, daß zusätzlich Luft durch das Trockensieb (8, 9), vorteilhaft aus dem einlaufenden Zwickel (28), abgesaugt wird, wobei die abgesaugte Luftmenge zumindest im wesentlichen der eingeblasenen Luftmenge entspricht.
- Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß die Lufteinblasung in gezielte Richtung (38, 39), beispielsweise zumindest in zwei unterschiedliche Richtungen erfolgt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Luft vor der Einblasung in die Taschen (22, 23, 24, 25) vorverteilt wird, um eine gleichmäßige Luftzufuhr zu erreichen.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine Luftmenge von 100 bis 500 m3/h m Arbeitsbreite, vorzugsweise von 200 bis 300 m3/h m Arbeitsbreite eingeblasen wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Geschwindigkeit der eingeblasenen Luftstrahlen im Bereich von 10 m/s bis 50 m/s , zweckmäßig zwischen 20 m/s und 40 m/s liegt.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Geschwindigkeit der Papierbahn (7) im Bereich von 600 bis 1500 m/min, vorzugsweise zwischen 1000 und 1400 m/min liegt.
- Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 6, die für einen Zylindertrockner einer Papiermaschine mit einer Zweisiebführung vorgesehen ist, der eine Lufteinblaseinrichtung aufweist, wobei die Lufteinblaseinrichtung (18, 19, 20, 21), insbesondere ein Lufteinblasrohr, in der vom Trockensieb (8, 9) und der Papierbahn (7) gebildeten Tasche (22, 23, 24, 25) vorgesehen ist, dadurch gekennzeichnet, daß zusätzlich ein Saugkasten (14, 15, 16, 17) in den zwischen den nebeneinander liegenden Trockenzylindern (1, 2, 3 bzw. 4, 5, 6) verbleibenden Räumen, die von den über den nebeneinander liegenden Trockenzylindern laufenden Trockensieben (8, 9) und den freien Sektoren der das betreffende Trockensieb führenden Leitwalze (10, 11, 12, 13) begrenzt sind, vorgesehen ist.
- Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Lufteinblaseinrichtung (18, 19, 20, 21), insbesondere in Reihen angeordnete, Löcher (44) und/oder Schlitze (45) , für den Luftaustritt aufweist, wobei mehrere Lochreihen bzw. Schlitze vorgesehen sein können, die in unterschiedliche Richtung gerichtet sind.
- Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß in der Lufteinblaseinrichtung (18, 19, 20, 21) eine Einrichtung (41) zur Vorverteilung der Luft zur gleichmäßigen, zweckmäßig senkrechten, Ausblasung, vorgesehen ist.
- Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die Lufteinblaseinrichtung als Schaberbalken (18, 19) ausgebildet ist, wobei der Schaber (37) als Luftleiteinrichtung wirken kann.
- Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß der Saugkasten (14, 15) an der Einlaufseite und/oder an der Auslaufseite zum Sieb zum Trockenzylinder (2, 3) gerichtete Dichtungen (32, 33), beispielsweise Bürsten, aufweist, die quer zur Bahnlaufrichtung verlaufen und im wesentlichen über die gesamte Breite der Papierbahn (7) bzw. des Trockensiebes (8, 9) reichen.
- Vorrichtung nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, daß der Saugkasten (14) an seinen Stirnseiten Abdeckplatten (35, 36) aufweist, die den Raum vom Saugkasten (14) zum Sieb (8) mit der daran anliegenden Papierbahn (7) bzw. zum freien Trockensieb (8) bzw. zum nicht siebberührten Umfang der Leitwalze (10) hin, abdichten.
- Vorrichtung nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, daß die Achse der Leitwalze (10, 11, 12, 13) aus der Mittelebene zweier nebeneinander liegender Trockenzylinder (1, 2 bzw. 2, 3 bzw. 4, 5 bzw. 5, 6) in Richtung zum in Bahnlaufrichtung ersten Trockenzylinder (2 bzw. 3 bzw. 5 bzw. 6) verschoben ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT137794A AT400728B (de) | 1994-07-13 | 1994-07-13 | Verfahren und vorrichtung an einem papiermaschinenzylindertrockner mit zweisiebführung |
AT137794 | 1994-07-13 | ||
AT1377/94 | 1994-07-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0692569A2 EP0692569A2 (de) | 1996-01-17 |
EP0692569A3 EP0692569A3 (de) | 1998-01-07 |
EP0692569B1 true EP0692569B1 (de) | 2001-04-11 |
Family
ID=3512573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950108417 Expired - Lifetime EP0692569B1 (de) | 1994-07-13 | 1995-06-01 | Verfahren und Vorrichtung an einem Papiermaschinenzylindertrockner mit Zweisiebführung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0692569B1 (de) |
AT (1) | AT400728B (de) |
DE (1) | DE59509168D1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19544881A1 (de) * | 1995-12-01 | 1997-06-12 | Voith Sulzer Papiermasch Gmbh | Maschine zur Herstellung einer kontinuierlichen Bahn |
DE10024296B4 (de) * | 2000-05-17 | 2008-11-20 | Voith Patent Gmbh | Maschine zur Herstellung einer Materialbahn |
FI121240B (fi) * | 2001-03-23 | 2010-08-31 | Metso Paper Automation Oy | Sovitelma paperikoneen yhteydessä ja puhalluslaatikko |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE340578A (de) * | 1926-11-11 | |||
DE1120262B (de) * | 1958-08-05 | 1961-12-21 | Wiessner Ges Fuer Raumluftgest | Trockenpartie fuer Papier-, Karton- oder Zellstoffentwaesserungsmaschinen |
US3263344A (en) * | 1963-07-31 | 1966-08-02 | Stickle Steam Specialties Co I | Drying system for paper-making machinery and the like |
FI62571C (fi) * | 1980-12-01 | 1983-01-10 | Valmet Oy | Anordning vid flercylindertork i en pappersmaskin |
US5600897A (en) * | 1993-08-06 | 1997-02-11 | J.M. Voith Gmbh | Mixed dryer section including single-tier and double-tier drying groups with automatic ropeless threading |
-
1994
- 1994-07-13 AT AT137794A patent/AT400728B/de not_active IP Right Cessation
-
1995
- 1995-06-01 DE DE59509168T patent/DE59509168D1/de not_active Expired - Fee Related
- 1995-06-01 EP EP19950108417 patent/EP0692569B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0692569A2 (de) | 1996-01-17 |
EP0692569A3 (de) | 1998-01-07 |
ATA137794A (de) | 1995-07-15 |
AT400728B (de) | 1996-03-25 |
DE59509168D1 (de) | 2001-05-17 |
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